Summary
The main directions of fragmentation of 2,3-trimethylenetetrahydroquinazolines (I, II) and 2,3-trimethylenetetrahydroquinazolin-4-ones (III, IV) are the elimination of the C9-C10 chain with the subsequent splitting out of a methyleneimine radical and the elimination of the C9-C11 chain with the migration of hydrogen to the neutral (I, II) or the charged (III, IV) fragment.
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Additional information
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodynykh Soedinenii, No. 3, pp. 378–382, May–June, 1977.
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Rashkes, Y.V., Telezhenetskaya, M.V., Plugar', V.N. et al. Mass spectra of tetrahydroquinazoline and tetrahydroquinazolin-4-one derivatives. Chem Nat Compd 13, 320–323 (1977). https://doi.org/10.1007/BF00573552
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DOI: https://doi.org/10.1007/BF00573552